Haven't had an epidural as such, but had a lumbar puncture some years ago (really bad experience, it caused screaming headaches afterwards whenever I was anything other than horizontal)
Vowed never to let anyone put a needle in my spine again.
DD had other ideas. She was a footling breech and refused to turn round. I had to have an elective C section, so had a spinal anaesthetic. I'd discussed, at length, why this was really not in my plans, and they were very good at explaining why the headache happened and what they could do if it happened again. No problems. (But words are had with DD on a frequent basis
My sister had an epidural, not for childbirth, but for stitching her up afterwards. It has caused her back problems since.
If you have coped with the pain before (says she who hasn't experienced the pains of childbirth, just the post op pain of a c section) then you know what you and your body can stand.